Disperse Dye Ink Composition for Dense Textile Printing
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Solution Overview
Problem
Conventional inkjet textile printing using disperse dyes faces challenges in achieving high print density on the surface of fabrics while maintaining stable recording performance and ink storage stability, often resulting in nozzle clogging and inadequate dispersion stability.
Innovation Solution
The use of a disperse dye-containing ink formulation comprising water, a disperse dye, an anionic high-molecular weight styrene-(meth)acrylic acid-based copolymer as a dispersant, and an acetylene glycol-based compound as a penetrant, with specific molecular weight and acid value ranges, to enhance dispersion stability and prevent excessive ink penetration into the fabric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a disperse dye dispersion is used for inkjet textile printing, then high print density can be achieved, but nozzle clogging occurs due to precipitate formation and viscosity increase
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight (8,000-20,000) and acid value (160-250 mg KOH/g) of the styrene-(meth)acrylic acid-based copolymer dispersant, as well as the particle size (0.03-0.1 μm) of the disperse dye. These parameter optimizations prevent precipitate formation and viscosity increase in the nozzle, resolving the contradiction between achieving high print density and preventing nozzle clogging
Solution Approach 2:
The patent uses a composite approach by combining disperse dye with a specifically designed styrene-(meth)acrylic acid-based copolymer dispersant. This composite formulation creates a stable dispersion system where the copolymer's specific molecular weight and acid value ranges provide optimal steric and electrostatic stabilization, preventing aggregation and maintaining nozzle flow stability while enabling high print density
2Quantity of substance
If ink formulation is optimized for high print density, then surface coverage improves, but ink storage stability deteriorates
Solution Approach 1:
The patent optimizes the particle size of the disperse dye to a specific range (0.03-0.1 μm) and controls the copolymer's molecular weight (8,000-20,000) and acid value (160-250 mg KOH/g). These parameter changes ensure sufficient steric hindrance and electrostatic repulsion to maintain dispersion stability during storage, while still achieving high print density on the fabric surface
3Stability of the object's composition
If conventional dispersants are used, then ink storage stability is maintained, but excessive penetration into fabric occurs reducing surface density
Solution Approach 1:
The patent uses a styrene-(meth)acrylic acid-based copolymer with specifically controlled molecular weight (8,000-20,000) and acid value (160-250 mg KOH/g). This specific parameter range provides optimal balance: the molecular weight is sufficient to provide steric stabilization for storage stability, while the acid value ensures appropriate electrostatic interactions that control penetration depth, maintaining high surface print density
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This formulation achieves high-quality, stable recording performance with high print density on the fabric surface and improved ink storage stability, preventing nozzle clogging and ensuring reliable inkjet textile printing.
Implementation Method 1
an anionic high-molecular dispersant, wherein the water-soluble organic solvent is at least one selected from glycerin, diethylene glycol, triethylene glycol, polyethylene glycol (average molecular weight of 200 to 600), dipropylene glycol and tripropylene glycol
Implementation Method 2
the anionic high-molecular dispersant is a styrene-(meth)acrylic acid-based copolymer having an acid value of 160 to 250 mg KOH/g
Implementation Method 3
the ink for inkjet textile printing further contains an acetylene glycol-based compound expressed by the following Chemical Formula (I) as a penetrant
Implementation Method 4
a humectant is added to suppress the evaporation of moisture. Examples of the humectant include a high-boiling water-soluble organic solvent
Implementation Method 5
a fabric made of a hydrophobic fiber material is subjected to inkjet printing and is then heated to be dyed
Implementation Method 6
the ink for inkjet textile printing further contains an acetylene glycol-based compound expressed by the following Chemical Formula (I) as a penetrant
Data Source
AI summary
Ink for inkjet textile printing of the present invention contains water, a disperse dye, a water-soluble organic solvent and an anionic high-molecular dispersant. The water-soluble organic solvent is a polyhydric alcohol such as glycerin. The water-soluble organic solvent is contained in an amount of 25 to 50 mass % with respect to the total mass of the ink. The anionic high-molecular dispersant is a styrene-(meth)acrylic acid-based copolymer having an acid value of 160 to 250 mg KOH/g and a weight-average molecular weight of 8,000 to 20,000. The ink for inkjet textile printing further contains an acetylene glycol-based compound expressed by the following Chemical Formula (I) as a penetrant. With this ink for inkjet textile printing, provided is disperse dye-containing ink for inkjet textile printing that has a high-quality and stable recording performance and achieves a high print density on the surface of a fabric while maintaining an ink storage stability, and an inkjet textile printing method using the ink for inkjet textile printing.